MIL-T-45380E(AT)
* 3.4.1.7 Silicone rubber hoses. When specified (see 6.2) silicone rubber radiator and heater hoses shall be furnished.
* 3.4.1.8 Powerplant heaters and fuel warmers. When specified (see 6.2) a coolant heater, an engine oil heater and a fuel warmer (diesel engine driven vehicles only) shall be provided. Unless otherwise specified (see 6.2), a battery heater shall be provided when power plant heaters are specified. Heaters shall operate on 110 volts alternating current (ac) and shall be wired through a junction block, including a fuse or circuit breaker, to a single three-pronged (male) weatherproof, slave receptacle for receiving external power and grounding the vehicle. A
three-wire connecting cable, 25 feet long and of adequate line capacity to supply power for all heater units simultaneously, shall be furnished. Connecting cable shall include a matching female connector at the vehicle end and a standard three-pronged (two power plus one ground) male connector at the other end. Electrical apparatus shall conform to Federal Motor Carrier Safety Regulation 393.77(c)(7). The electrical insulation of the connecting cable shall withstand normal operating stresses in low ambient air temperatures (down to minus 60°F) without cracking or loss of dielectric capacity. All heater lead wires shall be installed without interfering with vehicle component operation and without loose excess wire. Provisions for stowage of the cable shall be provided in the vehicle cab. Heaters shall be furnished as follows:
* (a) A coolant heater, 1,000-watt minimum rating, shall be installed in the engine block or in the lower coolant inlet hose. An engine thermostat with an operating range of
170°F to 195oF shall be installed.
* (b) An oil pan heater of the permanent external surface mount, permanent in-pan mount,
or immersion type that meets the following requirements, shall be installed: (1) Not less than 22 watts per quart heating capacity
(2) Not more than 18 watts per square inch heating capacity
(3) Thermal balance design or thermostat control providing for uninterrupted
operation
(4) Provision for mounting below minimum service oil level.
(c) The battery heater shall have a capacity adequate to maintain the battery electrolyte at a temperature of not less than 10°F during vehicle exposure in ambient air
temperature as low as minus 60°F, and shall embody a thermostat to limit the temperature of the electrolyte to not more than 80°F.
(d) A fuel warmer or pre-heater shall be provided on diesel engine driven vehicles to prevent clogging of fuel filters due to wax crystallization in the fuel. The fuel warmer
shall use engine coolant to transfer sufficient heat to the diesel fuel to heat it from an inlet temperature of minus 40°F to an outlet temperature of plus 9°F, with a fuel flow
rate not less than the maximum fuel demand of the engine fuel system. A coolant shutoff valve shall be provided for the coolant inlet side of the fuel warmer unit.
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